<template>
  <div class="component-upload-image">
    <el-upload
      ref="imageUpload"
      v-loading="loading"
      multiple
      :file-type="fileType"
      :file-size="fileSize"
      :limit="limit"
      :http-request="customUpload"
      action="#"
      list-type="picture-card"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      :class="{ hide: fileList.length >= limit }"
      :on-remove="handleDelete"
      :before-upload="handleBeforeUpload"
    >
      <el-icon class="avatar-uploader-icon">
        <plus />
      </el-icon>
    </el-upload>
    <!-- 上传提示 -->
    <div v-if="showTip" class="el-upload__tip">
      请上传
      <template v-if="fileSize">
        大小不超过
        <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为
        <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的文件
    </div>

    <el-dialog v-model="dialogVisible" title="预览" width="800px" append-to-body>
      <img :src="dialogImageUrl" style="display: block; margin: 0 auto; max-height: 600px" />
    </el-dialog>
  </div>
</template>

<script setup>
import ConfigAPI from "@/api/system/config";
import { getAccessToken } from "@/utils/auth";
import { getCurrentInstance, ref, computed, watch, defineProps, defineEmits } from "vue";

const props = defineProps({
  modelValue: [String, Object, Array],
  // 图片数量限制
  limit: {
    type: Number,
    default: 1,
  },
  // 大小限制(MB)
  fileSize: {
    type: Number,
    default: 5,
  },
  // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileType: {
    type: Array,
    default: () => ["png", "jpg", "jpeg"],
  },
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: true,
  },
});

const { proxy } = getCurrentInstance();
const emit = defineEmits();
const number = ref(0);
const uploadList = ref([]);
const dialogImageUrl = ref("");
const dialogVisible = ref(false);
const baseUrl = import.meta.env.VITE_APP_BASE_API;
const reallyUrl = import.meta.env.VITE_API_IMAGE;
const headers = ref({ Authorization: "Bearer " + getAccessToken() });
const fileList = ref([]);
const showTip = computed(() => props.isShowTip && (props.fileType || props.fileSize));
const loading = ref(false);

watch(
  () => props.modelValue,
  (val) => {
    if (val) {
      // 首先将值转为数组
      const list = Array.isArray(val) ? val : props.modelValue.split(",");
      // 然后将数组转为对象数组
      fileList.value = list.map((item) => {
        return { name: item.name, url: item.url };
      });
    } else {
      fileList.value = [];
    }
  },
  { deep: true, immediate: true }
);

// 上传前loading加载
function handleBeforeUpload(file) {
  let isImg = false;
  if (props.fileType.length) {
    let fileExtension = "";
    if (file.name.lastIndexOf(".") > -1) {
      fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
    }
    isImg = props.fileType.some((type) => {
      if (file.type.indexOf(type) > -1) return true;
      if (fileExtension && fileExtension.indexOf(type) > -1) return true;
      return false;
    });
  } else {
    isImg = file.type.indexOf("image") > -1;
  }
  if (!isImg) {
    ElMessage.error(`文件格式不正确，请上传${props.fileType.join("/")}图片格式文件!`);
    return false;
  }
  if (file.name.includes(",")) {
    ElMessage.error("文件名不正确，不能包含英文逗号!");
    // proxy.$modal.msgError("文件名不正确，不能包含英文逗号!");
    return false;
  }
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize;
    if (!isLt) {
      ElMessage.error(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
      isImg = false;
      // proxy.$modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
      return false;
    }
  }
  // proxy.$modal.loading("正在上传图片，请稍候...");
  number.value++;
  return true;
}

// 文件个数超出
function handleExceed() {
  proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

// 上传成功回调
// function handleUploadSuccess(res, file) {
//   if (res.code === 200) {
//     uploadList.value.push({ name: res.msg, url: res.msg });
//     uploadedSuccessfully();
//   } else {
//     number.value--;
//     proxy.$modal.closeLoading();
//     proxy.$modal.msgError(res.msg);
//     proxy.$refs.imageUpload.handleRemove(file);
//     uploadedSuccessfully();
//   }
// }

// 删除图片
function handleDelete(file) {
  for (let i = 0; i < fileList.value.length; i++) {
    if (file.name == fileList.value[i].name) {
      fileList.value.splice(i, 1);
      emit("update:modelValue", fileList.value);
    }
  }
}

// 上传结束处理
function uploadedSuccessfully() {
  if (number.value > 0 && uploadList.value.length === number.value) {
    fileList.value = fileList.value.filter((f) => f.url !== undefined).concat(uploadList.value);
    fileList.value.forEach((item) => {
      item.url = `${reallyUrl}/${item.name}`;
    });
    uploadList.value = [];
    number.value = 0;
    emit("update:modelValue", fileList.value);
    ElMessage.closeLoading();
  }
}

// 上传失败
// function handleUploadError() {
//   proxy.$modal.msgError("上传图片失败");
//   proxy.$modal.closeLoading();
// }

// 预览
function handlePictureCardPreview(file) {
  dialogImageUrl.value = file.url;
  dialogVisible.value = true;
}

// 对象转成指定字符串分隔
function listToString(list, separator) {
  let strs = "";
  separator = separator || ",";
  for (let i in list) {
    if (undefined !== list[i].url && list[i].url.indexOf("blob:") !== 0) {
      strs += list[i].url.replace(reallyUrl, "") + separator;
    }
  }
  return strs != "" ? strs.substr(0, strs.length - 1) : "";
}

// 自定义上传逻辑
const customUpload = async (file) => {
  try {
    loading.value = true;
    const imageWH = await getImageWH(file.file);
    const formData = new FormData();
    formData.append("file", file.file); // 确保字段名与后端接口一致
    const data = await ConfigAPI.uploadFile(formData, {
      headers: { ...headers.value, "Content-Type": "multipart/form-data" },
    });
    console.log(data);

    if (data.data) {
      loading.value = false;
    }
    fileList.value.push({
      name: data.data.name,
      url: data.data.url,
      width: imageWH.width,
      height: imageWH.height,
      type: 1,
    });
    emit("update:modelValue", fileList.value);
  } catch (error) {
    loading.value = false;
    ElMessage.error("上传图片失败");
  }
};

// 获取图片宽高
function getImageWH(file) {
  return new Promise((resolve, reject) => {
    const img = new Image();
    img.onload = () => {
      const width = img.width; // 图片宽度
      const height = img.height; // 图片高度
      resolve({ width, height }); // 返回宽高信息
    };
    img.onerror = () => {
      reject(new Error("Failed to load image"));
    };
    img.src = URL.createObjectURL(file);
  });
}
</script>

<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
:deep(.hide .el-upload--picture-card) {
  display: none;
}

:deep(.el-upload-list__item) {
  width: 80px;
  height: 80px;
}

:deep(.el-upload--picture-card) {
  width: 80px;
  height: 80px;
}
</style>
